David is a 10-year-old boy．He wants to buy something for his mother,because next Monday is her birthday．David's father gives him 5 dollars a week and David puts 2 dollars a week in to a box in his room．After three months，David has 24 dollars in the box．He takes 20 dollars out of his box and goes to a big store．He wants something really great for his mother．
David sees a beautiful brooch（胸针）．It is in the shape(呈……形状)his favourite animal．It is only$17.00．“I like it．”thinks David．“My mother loves brooches and she will like it,too．”He buys the brooch and takes it home．He puts it in a beautiful box,and puts the box on the dining table．David is very happy．He thinks he will see the smile on his mother's face．
But when his mother opens the box．She screams(尖叫)．She sees a spider(蜘蛛)in the box!She is afraid of spiders so much!
根据材料内容简要回答下列问题。
